Abstract
Abstract Based on the catalog of merging galaxies in the Early Data Release of the Sloan Digital Sky Survey, the differences of star-formation history between merging galaxies and field galaxies were studied statistically by means of three spectroscopic indicators: the 4000-Å break strength, the Balmer absorption-line index, and the specific star formation rate. It is found that for early-type merging galaxies the interactions will not induce any significant enhancement of the star-formation activity because of its stability and lack of cool gas. On the other hand, late-type merging galaxies always in general display more active star formation than field galaxies on different timescales within about 1 Gyr. We also conclude that the mean stellar ages of late-type merging galaxies are younger than those of late-type field galaxies.
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